2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * afs_vnop_access.c - access vop ccess mode bit support for vnode operations.
22 #include <afsconfig.h>
23 #include "../afs/param.h"
27 #include "../afs/sysincludes.h" /* Standard vendor system headers */
28 #include "../afs/afsincludes.h" /* Afs-based standard headers */
29 #include "../afs/afs_stats.h" /* statistics */
30 #include "../afs/afs_cbqueue.h"
31 #include "../afs/nfsclient.h"
32 #include "../afs/afs_osidnlc.h"
35 #define ANONYMOUSID 32766 /* make sure this is same as in ptserver.h */
41 /* access bits to turn off for various owner Unix mode values */
42 static char fileModeMap[8] = {
43 PRSFS_READ | PRSFS_WRITE,
44 PRSFS_READ | PRSFS_WRITE,
53 /* avc must be held. Returns bit map of mode bits. Ignores file mode bits */
54 afs_int32 afs_GetAccessBits (avc, arights, areq)
55 register struct vcache *avc;
56 register afs_int32 arights;
57 register struct vrequest *areq;
59 AFS_STATCNT(afs_GetAccessBits);
60 /* see if anyuser has the required access bits */
61 if ((arights & avc->anyAccess) == arights) {
65 /* look in per-pag cache */
66 if (avc->Access) { /* not beautiful, but Sun's cc will tolerate it */
69 ac = afs_FindAxs(avc->Access, areq->uid);
71 return (arights & ac->axess);
75 if (!(avc->states & CForeign)) {
76 /* If there aren't any bits cached for this user (but the vnode
77 * _is_ cached, obviously), make sure this user has valid tokens
78 * before bothering with the RPC. */
80 extern struct unixuser *afs_FindUser();
81 tu = afs_FindUser( areq->uid, avc->fid.Cell, READ_LOCK );
83 return (arights & avc->anyAccess);
85 if ((tu->vid == UNDEFVID) || !(tu->states & UHasTokens) ||
86 (tu->states & UTokensBad)) {
87 afs_PutUser(tu, READ_LOCK);
88 return (arights & avc->anyAccess);
91 afs_PutUser(tu, READ_LOCK);
95 { /* Ok, user has valid tokens, go ask the server. */
96 struct AFSFetchStatus OutStatus;
99 code = afs_FetchStatus(avc, &avc->fid, areq, &OutStatus);
100 return (code ? 0 : OutStatus.CallerAccess & arights);
105 /* the new access ok function. AVC must be held but not locked. if avc is a
106 * file, its parent need not be held, and should not be locked. */
108 afs_AccessOK(avc, arights, areq, check_mode_bits)
110 afs_int32 arights, check_mode_bits;
111 struct vrequest *areq; {
112 register struct vcache *tvc;
113 struct VenusFid dirFid;
114 register afs_int32 mask;
116 register afs_int32 fileBits;
118 AFS_STATCNT(afs_AccessOK);
120 if ((vType(avc) == VDIR) || (avc->states & CForeign)) {
121 /* rights are just those from acl */
122 return (arights == afs_GetAccessBits(avc, arights, areq));
125 /* some rights come from dir and some from file. Specifically, you
126 * have "a" rights to a file if you are its owner, which comes
127 * back as "a" rights to the file. You have other rights just
128 * from dir, but all are restricted by the file mode bit. Now,
129 * if you have I and A rights to a file, we throw in R and W
130 * rights for free. These rights will then be restricted by
131 * the access mask. */
133 if (avc->parentVnode) {
134 dirFid.Cell = avc->fid.Cell;
135 dirFid.Fid.Volume = avc->fid.Fid.Volume;
136 dirFid.Fid.Vnode = avc->parentVnode;
137 dirFid.Fid.Unique = avc->parentUnique;
138 /* Avoid this GetVCache call */
139 tvc = afs_GetVCache(&dirFid, areq, (afs_int32 *)0,
140 (struct vcache*)0, WRITE_LOCK);
142 dirBits = afs_GetAccessBits(tvc, arights, areq);
143 afs_PutVCache(tvc, WRITE_LOCK);
147 dirBits = 0xffffffff; /* assume OK; this is a race condition */
148 if (arights & PRSFS_ADMINISTER)
149 fileBits = afs_GetAccessBits(avc, arights, areq);
151 fileBits = 0; /* don't make call if results don't matter */
153 /* compute basic rights in fileBits, taking A from file bits */
154 fileBits = (fileBits & PRSFS_ADMINISTER) | (dirBits & ~PRSFS_ADMINISTER);
156 /* for files, throw in R and W if have I and A (owner). This makes
157 insert-only dirs work properly */
158 if (vType(avc) != VDIR && (fileBits & (PRSFS_ADMINISTER | PRSFS_INSERT)) ==
159 (PRSFS_ADMINISTER | PRSFS_INSERT))
160 fileBits |= (PRSFS_READ | PRSFS_WRITE);
162 if (check_mode_bits & CHECK_MODE_BITS) {
163 /* owner mode bits are further restrictions on the access mode
164 * The mode bits are mapped to protection bits through the
165 * fileModeMap. If CMB_ALLOW_EXEC_AS_READ is set, it's from the
166 * NFS translator and we don't know if it's a read or execute
167 * on the NFS client, but both need to read the data.
169 mask = (avc->m.Mode & 0700) >> 6; /* file restrictions to use */
170 fileBits &= ~fileModeMap[mask];
171 if (check_mode_bits & CMB_ALLOW_EXEC_AS_READ) {
172 if (avc->m.Mode & 0100) fileBits |= PRSFS_READ;
175 return ((fileBits & arights) == arights); /* true if all rights bits are on */
180 #if defined(AFS_SUN5_ENV) || (defined(AFS_SGI_ENV) && !defined(AFS_SGI65_ENV))
181 afs_access(OSI_VC_ARG(avc), amode, flags, acred)
184 afs_access(OSI_VC_ARG(avc), amode, acred)
187 register afs_int32 amode;
188 struct AFS_UCRED *acred; {
189 register afs_int32 code;
190 struct vrequest treq;
193 AFS_STATCNT(afs_access);
194 afs_Trace3(afs_iclSetp, CM_TRACE_ACCESS, ICL_TYPE_POINTER, avc,
195 ICL_TYPE_INT32, amode,
196 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->m.Length));
197 if (code = afs_InitReq(&treq, acred)) return code;
199 code = afs_VerifyVCache(avc, &treq);
201 code = afs_CheckCode(code, &treq, 16);
205 /* if we're looking for write access and we have a read-only file system, report it */
206 if ((amode & VWRITE) && (avc->states & CRO)) {
209 code = 1; /* Default from here on in is access ok. */
210 if (avc->states & CForeign) {
211 /* In the dfs xlator the EXEC bit is mapped to LOOKUP */
213 code = afs_AccessOK(avc, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS);
214 if (code && (amode & VWRITE)) {
215 code = afs_AccessOK(avc, PRSFS_WRITE, &treq, CHECK_MODE_BITS);
216 if (code && (vType(avc) == VDIR)) {
218 code = afs_AccessOK(avc, PRSFS_INSERT, &treq, CHECK_MODE_BITS);
220 code = afs_AccessOK(avc, PRSFS_DELETE, &treq, CHECK_MODE_BITS);
223 if (code && (amode & VREAD))
224 code = afs_AccessOK(avc, PRSFS_READ, &treq, CHECK_MODE_BITS);
226 if (vType(avc) == VDIR) {
228 code = afs_AccessOK(avc, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS);
229 if (code && (amode & VWRITE)) {
230 code = afs_AccessOK(avc, PRSFS_INSERT, &treq, CHECK_MODE_BITS);
232 code = afs_AccessOK(avc, PRSFS_DELETE, &treq, CHECK_MODE_BITS);
234 if (code && (amode & VREAD))
235 code = afs_AccessOK(avc, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS);
238 code = afs_AccessOK(avc, PRSFS_READ, &treq, CHECK_MODE_BITS);
242 * The nfs server in read operations for non-owner of a file
243 * will also check the access with the VEXEC (along with VREAD)
244 * because for them exec is the same as read over the net because of
245 * demand loading. But this means if the mode bit is '-rw' the call
246 * will fail below; so for this particular case where both modes are
247 * specified (only in rfs_read so far) and from the xlator requests
250 if (!((amode & VREAD) && AFS_NFSXLATORREQ(acred)))
252 if ((avc->m.Mode & 0100) == 0) code = 0;
253 } else if (avc->m.Mode & 0100) code = 1;
255 if (code && (amode & VWRITE))
257 code = afs_AccessOK(avc, PRSFS_WRITE, &treq, CHECK_MODE_BITS);
259 /* The above call fails when the NFS translator tries to copy
260 ** a file with r--r--r-- permissions into a directory which
261 ** has system:anyuser acl. This is because the destination file
262 ** file is first created with r--r--r-- permissions through an
263 ** unauthenticated connectin. hence, the above afs_AccessOK
264 ** call returns failure. hence, we retry without any file
265 ** mode bit checking */
266 if ( !code && AFS_NFSXLATORREQ(acred) && avc->m.Owner == ANONYMOUSID)
267 code=afs_AccessOK(avc,PRSFS_WRITE, &treq, DONT_CHECK_MODE_BITS);
269 if (code && (amode & VREAD))
270 code = afs_AccessOK(avc, PRSFS_READ, &treq, CHECK_MODE_BITS);
274 return 0; /* if access is ok */
276 code = afs_CheckCode(EACCES, &treq, 17); /* failure code */
281 #if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
284 * This function is just an interface to afs_GetAccessBits
286 int afs_getRights(OSI_VC_ARG(avc), arights, acred)
288 register afs_int32 arights;
289 struct AFS_UCRED *acred;
291 register afs_int32 code;
292 struct vrequest treq;
295 if (code = afs_InitReq(&treq, acred)) return code;
297 code = afs_VerifyVCache(avc, &treq);
299 code = afs_CheckCode(code, &treq, 16);
303 return afs_GetAccessBits(avc, arights, &treq);
305 #endif /* defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS) */